cylinder missfire

I have a 99 Plymouth Breeze 2.0 16v sohc that is showing #3 cylinder missfire; and so far I have replaced plugs, wires,coilpack and no change.
The compression is pretty much the same on all 4 cylinders. I have NOT done a leakdown test yet any suggestions?? Sometimes car runs fine other times it is obviously only running on 3 cylinders. HELP??

this could be a fuel injector problem. try removing injectors and soaking in plastic safe injector cleaner for about 30 minutes and put it back in. it could be clogging up and not allowing gas to flow freely.